Right-clicking on an animation while running stops the animation and opens a window. If the animation is restablished and again right-clicked, then indeed the system crashes.
> Date: Sun, 1 Jan 2012 02:25:59 -0500
> From: a at b.c
> Subject: Right-clicking on animation crashes Mathematica
> To: mathgroup at smc.vnet.net
>
>
> Can anyone reproduce the following?
>
> In Mathematica 8.04 in Windows Vista or Windows 7, right-clicking on
> an animation while it is running crashes the entire Mathematica
> session (kernel and front-end).
>
>